Physics - Kinematics Question with Solution | TestHub

PhysicsKinematicsRelativeMedium2 minQB

PhysicsMediumsingle choice

Passage / Comprehension

A long straight road connects two towns, A and B. There are two small towns, C and D, between towns A and B. The condition of the road between towns C and D is bad. Two cars travel from A to B at a constant speed $v_{1}$ everywhere except between towns C and D, where they travel at speed $v_{2}$ . In the following graph, the separation between the cars is shown with respect to time for a time interval of 80 seconds.

The value of $v_{2}$ is

Options:

Answer:

Solution:

In time interval $20 \leq t \leq 30$ , separation decreases because car 1 is on bad road.

So $v_{1} - v_{2} = \frac{250 - 150}{30 - 20} = 10 \Rightarrow v_{2} = v_{1} - 10 = 15 m / s$

Stream:JEESubject:PhysicsTopic:KinematicsSubtopic:Relative

⏱ 2mℹ️ Source: QB

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